I have a 1998 Chevy K1500. I've replaced the compressor, a/c hoses, and accumulator. I need to replace the orifice tube. Problem is I can't seem to find where it is. I have checked the bottom line of the evaporator..not there, I've check both evaporator lines...nothing. Any ideas?

This truck was wrecked and rebuilt. It is possible that this part was left out.

I have a 97 Sierra and after trying to locate and replace the orifice tube, I couldn't find one in the lines connecting to the condensor. I was going to put one in anyway but the one they sold me didn't fit. After investigating some more I realized that someone had put a pancake style filter/orifice? inline from the condensor to the evaporator. The reason I am confused is because I'm trying to fix my ac and my gauges are saying that I'm not getting enough pressure (high side) and I had put 8 oz of pag oil in my compressor before evacuating/recharge. I did notice oil wanting to come out of the high side ports when installing. Maybe the line is clogged at the pancake?

The orifice tube is in a slightly bulged section of the line at the threaded connection to the condensor. Once you break the fitting you will see the end of it. Do yourself a big favor and borrow from the parts store or buy a puller/installer tool. The new ones are hard to push in most of the time and you will end up mashing the end of it pushing it in. Make sure to coat the o-rings with PAG first.

8oz seems like a lot of oil to add unless the system was empty of it before. If it is wanting to leak out when you hook up your gauges you may have a tad too much oil in there.